ESSAY: The British £300 Billion Defence Plan — Ukraine as a Professor of War

Introduction: When NATO takes the Ukrainian lesson to heart — at £300 billion

A long-overdue plan, finally presented

The British Defence Investment Plan (DIP), awaited for months in the defence circles of London and Brussels, was finally unveiled in the run-up to the NATO summit in Ankara. The document covers more than £300 billion in major defence projects over a ten-year period. It is the most ambitious rearmament plan in the United Kingdom since the end of the Cold War — and it is explicitly described as inspired by the tactics and lessons drawn from the war in Ukraine.

NATO Secretary General Mark Rutte, visiting London before the Ankara summit, welcomed the announcement. He said he was convinced that Andy Burnham — the likely successor to Keir Starmer — would honour the Alliance's long-term spending commitments. Rutte noted that the target of 3.5 percent of GDP by 2035 would not be reached "in one giant step," but progressively — a realistic concession to the British economic reality.

The political context: Starmer, Burnham, and a transition under pressure

Keir Starmer was in the final stretch of his government leadership during this meeting with Rutte. The Secretary General described their meeting at Downing Street as his "last" with the Prime Minister, and thanked him for having "pushed the rest of Europe and the world to stay very engaged in Ukraine." That assessment is fair: Starmer maintained resolute support for Kyiv despite domestic pressures, and the United Kingdom remained one of Ukraine's top military suppliers after the United States.

But this is also a moment to reckon with shortcomings, not just accomplishments. John Healey had resigned as Defence Secretary, stating that the United Kingdom was moving too slowly toward the 3.5 percent of GDP target. Starmer himself had proposed spending only 2.68 percent of GDP by 2030 — well below the pace demanded by Europe's new geopolitical reality. The DIP is a belated correction of that insufficient trajectory.

The Ukrainian lessons encoded in the DIP

The doctrine of drones and asymmetric warfare

The British Defence Investment Plan draws directly on the lessons of the Ukrainian conflict in its investment priorities. Drones — reconnaissance, attack, saturation — form one of the priority investment categories. The United Kingdom has observed how Ukraine used low-cost drones to degrade Russian military systems that were infinitely more expensive, and has drawn the conclusion that the British defence industrial base must develop similar capabilities at scale.

Multi-layered air defence systems — capable of simultaneously handling low-altitude drones and ballistic missiles — form a second major investment axis. Ukraine demonstrated that air defence is the first imperative of a nation at war in the modern era: without protection from above, civilian and military infrastructure become easy targets. The United Kingdom, whose domestic air defence had been gradually reduced through decades of budget cuts, must rebuild this foundational capability.

Logistics and munitions: the endurance lesson

Ukraine also demonstrated that modern high-intensity wars consume munitions at a rate Western armies had not anticipated since the end of the Cold War. The British DIP includes substantial investments in rebuilding and expanding munitions stockpiles, in domestic industrial production capacity, and in accelerated production contracts with the defence industry. This is an indirect admission that for two decades, the United Kingdom had underinvested in the "volume of fire" of its forces in favour of a small number of high-tech systems.

The DIP's funding shortfall, initially estimated at £18 billion, had been reduced to under £4 billion after the new Defence Secretary Dan Jarvis secured an additional £1 billion. That deficit-reduction effort reveals as much about the budget constraints as about political will: the United Kingdom is willing to rearm, but is still searching for the financing to make it possible without compromising other public spending priorities.

The 3.5 percent GDP target: the arithmetic of deterrence

Why 3.5 percent and not 2 percent

The target of 3.5 percent of GDP in defence spending by 2035, set as an ambition by NATO, represents a radical break with the previous decade in which even the minimum of 2 percent of GDP was struggled to meet. For the United Kingdom, reaching 3.5 percent would mean increasing defence spending by nearly £30 billion a year beyond current levels. It is a budgetary transformation comparable to the creation of a major new public service.

The rationale for this target is both geopolitical and economic. Rutte underlined that rearmament can sustain economic growth and create jobs — an argument that Burnham, with his interventionist economic policy profile, should receive well. Defence spending in leading-edge technology sectors — drones, cybersecurity, defence electronics — generates knock-on effects for the civilian economy. Germany, which is on track to reach 3 percent of GDP in defence by 2029, six years ahead of the target, provides the proof of concept.

The European comparison: who is doing what

In 2025, all 32 NATO allies met the 2 percent of GDP defence spending target for the first time. European and Canadian spending rose 20 percent in real terms to reach $574 billion — the largest annual increase in Alliance history. Poland is on track to dedicate 5 percent of its GDP to defence. Norway is spending more on defence per capita than the United States. This collective movement, largely accelerated by the war in Ukraine and doubts about American reliability, is the most significant transformation of the European defence architecture since the end of the Cold War.

In this context, the United Kingdom with its £300 billion plan is positioning itself as the European rearmament leader — but with a structural delay relative to countries like Poland that started earlier and faster. Brexit has complicated the United Kingdom's integration into European Union defence procurement programs, creating duplications and inefficiencies that the DIP will need to navigate carefully.

NATO nuclear sharing: the other file at the Ankara summit

Expanding the nuclear umbrella as doubts about Trump mount

The British DIP fits within a broader context of anxiety about the reliability of the American nuclear umbrella. Specialist magazine 19fortyfive revealed in June 2026 that NATO was considering the largest expansion of its nuclear weapons sharing agreement since the Cold War, driven by the war in Ukraine and doubts about Trump's commitment. Countries such as Poland and the Baltic states have expressed interest in hosting American dual-capable nuclear aircraft.

French President Emmanuel Macron had on his side proposed, in a speech at the Île Longue naval base, deploying elements of the French nuclear deterrent on allied territory — a spectacular shift from the French doctrine of nuclear independence. This convergence of signals reveals deep anxiety in European capitals: if Washington steps back, who guarantees Europe's nuclear deterrence?

The United Kingdom in the European nuclear architecture

The United Kingdom, an independent nuclear power with its Trident submarine fleet, is a central player in this discussion. The DIP includes investments in maintaining and modernising the British nuclear deterrent — a budget line that, on its own, represents tens of billions. The question of coordination between the British nuclear deterrent, the French deterrent, and the American nuclear umbrella is one of the most complex and discreet strategic debates within NATO in 2026.

In this context, the United Kingdom's presence at the Ankara summit with its DIP in hand is not merely a budgetary contribution. It is a political signal: the United Kingdom remains committed to Europe's security despite Brexit, and is investing its nuclear and conventional capabilities in collective defence. That is an important message at a moment when Alliance cohesion is under constant strain.

The British defence industry: from doctrine to production

BAE Systems and supply chains under pressure

A £300 billion defence plan is only as useful as the British defence industry's capacity to deliver it within reasonable timelines. BAE Systems, Rolls-Royce Defence, Babcock, and a chain of second-tier suppliers form the backbone of that industry. These companies have increased production since 2022, but constraints on critical materials, electronic components, and above all skilled labour limit the possible pace of ramp-up.

The DIP includes investments in defence workforce training and in expanding industrial capacities — but these investments take years to produce results. This is the paradox of accelerated rearmament: the threat is now, but new industrial capacities take time to materialise. The United Kingdom is counting on an off-the-shelf procurement strategy abroad to fill immediate gaps while building domestic capacity over the longer term.

Defence procurement and Burnham's philosophy

In a speech delivered before he officially took the Labour leadership, Andy Burnham criticised British public procurement policy based on seeking "best price globally" and promised that every taxpayer pound would "work harder for him" — a formulation suggesting a preference for domestic procurement. Applied to defence, this philosophy could generate tensions with NATO allies who favour interoperable joint purchases.

Rutte emphasised that European rearmament must be coordinated to avoid duplication and maximise interoperability. The temptation to buy national in defence is politically understandable, but risks producing equipment incompatible with that of allies. This is one of the fundamental tensions in current European rearmament: between the national industrial logic and NATO's interoperability imperatives.

Ukraine as model and indirect beneficiary

Starmer pushed Europe — Burnham will have to hold the line

Rutte explicitly thanked Starmer for having "pushed the rest of Europe and the world to stay very engaged in Ukraine." That personal balance sheet underlines the importance of individual leadership in transatlantic defence policy. Where Starmer represented continuity and commitment to Ukraine, Burnham will need to demonstrate that he follows the same line — and that the leadership change does not produce any loosening in British support for Kyiv.

Ukraine has benefited directly from British support: Storm Shadow missiles, drones, precision munitions, pilot and officer training, intelligence. These deliveries have helped sustain Ukraine's capacity for resistance and deep strikes. This concrete support is the best case the United Kingdom can make for its credibility within NATO and for its legitimacy in participating in the Alliance's strategic decisions.

Ukrainian field lessons in British doctrine

The British Army has sent observers to the Ukrainian front since the start of the conflict, and the lessons gathered have fed into significant doctrinal reforms. Drone warfare, electronic warfare, the combination of precision fire and saturation, naval access-denial operations: all areas in which Ukrainian experience has shifted British general staff thinking about future wars. The DIP translates these lessons into concrete investment.

There is an irony of history in this: Ukraine, which received United Kingdom support for its defence, has become the primary military innovation laboratory from which the United Kingdom is drawing lessons for its own rearmament. This reciprocity — Western aid to Ukraine generating lessons that strengthen Western defence — is one of the least-discussed but most important dimensions of this conflict.

The transatlantic context: Trump, NATO, and a dependency to reconfigure

The Trump effect on European defence spending

It would be intellectually dishonest not to acknowledge that the British DIP and the broader wave of European rearmament have been accelerated, in part, by the uncertainties created by the Trump administration over its NATO commitment. When the American president suggests he would not defend allies who do not contribute sufficiently to their own defence, European capitals take those statements seriously. The combination of an aggressive Russia and an America whose support is conditional has created the political urgency needed to unlock budgets that had been stagnant for years.

Trump has thus paradoxically become one of the involuntary agents of European rearmament. By casting doubt on the automaticity of Article 5, he pushed European allies to develop autonomous capabilities rather than relying on the American guarantee. It is a reality that Rutte navigated carefully — crediting European contributions without alienating Washington. This dependency to be reconfigured is one of the most complex strategic projects of the coming decade for NATO.

The irreplaceable American contribution in the short term

Despite political uncertainties, the United States remains an irreplaceable defence partner for Europe in the near term. Strategic nuclear capabilities, satellite intelligence, long-range precision munitions, integrated command systems, and American logistical support cannot be quickly replaced by European capabilities. The British DIP acknowledges this implicitly: even with £300 billion, the United Kingdom remains dependent on the United States for certain critical capabilities.

The challenge for Burnham and other European leaders is therefore to develop autonomous capabilities sufficient to sustain credible deterrence independently of Washington's mood, while maintaining the transatlantic alliance as the foundational pillar of European security. It is a delicate balance that the Ankara summit attempted to formalise in concrete commitments.

Starmer's legacy and British strategic continuity

What Starmer leaves Burnham

The transition from Starmer to Burnham comes at a pivotal moment. Starmer leaves a United Kingdom that has demonstrated its determination to support Ukraine, that has maintained its NATO ties despite Brexit, and that has initiated the rearmament process embodied in the DIP. These are significant strategic assets. But he also leaves an only partially closed funding gap, a defence industrial base under pressure, and a political transition whose adversaries — notably Moscow — will watch closely for details.

Rutte publicly expressed confidence in Burnham — a diplomatic way of signalling that any break in continuity would be noticed and poorly received. That stated confidence is also political pressure: Burnham knows that his first months in office will be judged on his capacity to maintain — or amplify — Starmer's defence commitments and support for Ukraine.

The role of military experts in the transition

Admiral Tony Radakin, Chief of the UK Defence Staff, publicly stated that Moscow's test for any new British leader would be their response on the defence question. This positioning of defence professionals in the political debate reveals a reality: in the face of documented Russian threats, military professionals leave little room for short-term populism. National security is the domain where the constraints of reality impose themselves most rapidly on political ambitions.

For Burnham, continuity on defence is not only a strategic imperative — it is also a domestic political imperative. British public opinion, after years of the Ukrainian war broadcast in real time, has absorbed the reality of the Russian threat. A leader who minimised this threat or reduced support for Kyiv would quickly find himself at odds with a majority of his fellow citizens and with the entire defence and intelligence establishment.

Conclusion: British rearmament — a necessary signal in an uncertain world

£300 billion for what, exactly?

The £300 billion of the British DIP is not a guarantee of security. It is a political signal, a budgetary direction, and an investment in industrial and military capacity that will take years to fully materialise. The real value of this plan is not in the numbers themselves — it is in the message it sends: the United Kingdom has understood that the world of 2026 is not the world of 2010, that Russia is a real and documented threat, and that deterrence requires concrete capabilities, not declarations.

At the Ankara summit, this plan places the United Kingdom in a position of diplomatic leadership in discussions on European rearmament. Diplomatic and military credibility is purchased with real investments, not with future promises. That is one of the most enduring lessons the Ukrainian conflict has imposed on every government in the Atlantic Alliance.

By Maxime Marquette, columnist

Columnist's transparency note

My sources and method

This analysis is based on journalistic and official sources from late June and early July 2026, notably The Guardian, Foreign Policy, and the public statements of Mark Rutte. Defence spending figures come from NATO declarations and official reports. I do not have access to the full text of the DIP, of which only summaries and public statements are currently available.

My stated bias

I support increased European defence spending in the current context of Russian threats and Indo-Pacific tensions. This bias makes me structurally positive toward plans like the British DIP, even as my critical capacity remains active on the gap between announcements and concrete results. I also acknowledge that prioritising defence spending can come into tension with pressing social needs — a complexity I do not seek to erase.

Sources

Primary sources

The Guardian — NATO chief confident Burnham will honour defence spending commitments — June 29, 2026

Euromaidan Press — Ukraine daily review — July 2026

Foreign Policy — Transatlanticism is not dead — it is being renegotiated — July 1, 2026

Secondary sources

The Guardian — Burnham and defence spending — June 28, 2026

The Guardian — NATO leaders fear they can no longer rely on U.S. help — June 27, 2026

19fortyfive — NATO is weighing the biggest expansion of nuclear weapons sharing since the Cold War — June 2026